Ferromagnetism in Cu-doped ZnO nanoparticles at room temperature
- 439 Downloads
Cu-doped ZnO nanoparticles were successfully synthesized and structurally characterized by using X-ray diffraction (XRD) and transmission electron microscope (TEM). XRD shows that Zn1−xCuxO (x ≤ 0.04) samples are single phase with the ZnO-like wurtzite structure, while the secondary phase Cu is observed in Zn0.95Cu0.05O sample. Magnetic measurements indicated that Zn1−xCuxO (x = 0.02, 0.03, 0.04) are ferromagnetic at room temperature and the magnetic moment per Cu atom decreased with increasing Cu concentration. XRD, TEM and X-ray photoelectron spectroscopy (XPS) analysis revealed that no ferromagnetic-related secondary phase was detected. The origin of the ferromagnetism in Zn1−xCuxO (x ≤ 0.04) was mainly due to Cu ions substituted into the ZnO lattice.
KeywordsMagnetic Semiconductor Room Temperature Ferromagnetism Citric Acid Complex Exhibit Room Temperature Short Separation Distance
This work was supported by the financial support of the National Nature Science Foundation of China (Grant Nos. 60778040), the Science and Technology program of “11th five-Year” of Education for Jilin province (No. 20070162 and 20070161) and the Science and Technology bureau of Key Program for Ministry of Education (Item No. 207025).the science and technology bureau of Jilin province (Item No. 20060518) and gifted youth program of Jilin province (No. 20060123).
- 5.T.S. Herng, S.P. Lau, S.F. Yu, H.Y. Yang, L. Wang, M. Tanemura et al., Phys. Lett. 90, 032509 (2007)Google Scholar
- 9.X. Liu, F. Lin, L. Sun, W. Cheng, X. Ma, W. Shi, Appl. Phys. Lett. 88, 062508 (2006)Google Scholar
- 11.D. Karmakar, S.K. Mandal, R.M. Kadam, P.L. Paulose, A.K. Rajarajan, T.K. Nath, A.K. Das, I. Dasguptaand G.P. Das, Phys. Rev. B 75, 144404 (2007)Google Scholar